CVE-2026-115730

LOW 3.1

i18next-http-backend 4.0.2 Protocol-Relative URL Injection via Namespace in interpolateUrl

CVSS Score

3.1

EPSS Score

0.0%

EPSS Percentile

0th

i18next-http-backend 4.0.2 contains an incomplete fix in interpolateUrl() that allows attackers to redirect translation requests by supplying an ns value starting with a slash. Attackers controlling the namespace value can form a protocol-relative URL in loadPath or addPath templates to load attacker-hosted translations, enabling UI content injection and cross-site scripting.

CWE	CWE-74
Vendor	i18next
Product	i18next-http-backend
Published	Oct 23, 2026

Stay Ahead of the Next One

Get instant alerts for i18next i18next-http-backend

Be the first to know when new low vulnerabilities affecting i18next i18next-http-backend are published — delivered to Slack, Telegram or Discord.

Get Free Alerts → Free · No credit card · 60 sec setup

CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N

Attack Vector

Network

Attack Complexity

High

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

None

Integrity

Low

Availability

None

Affected Versions

i18next / i18next-http-backend

4.0.2 < 4.0.3

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/i18next/i18next-http-backend/security/advisories/GHSA-9jhj-wvmw-cfx5 github.com: https://github.com/i18next/i18next-http-backend/commit/042c3d4e4e9d73b2ae3aa76b22cb45d48f1e35b7 github.com: https://github.com/i18next/i18next-http-backend/security/advisories/GHSA-xvq9-wjp8-hwqf vulncheck.com: https://www.vulncheck.com/advisories/i18next-http-backend-4.0.2-protocol-relative-url-injection-via-namespace-in-interpolateurl

Credits

Zachariah Mithani (AploSec)